What are files ending in .atf ?they are the files used on the archos 404 multimedia players.?

as I said they are the file ending when I record a movie off of the tv or dvd and when I connect to my notebook to transfer all that transfers to windows media player is the sound and not even that if it is recorded from a dvd.what can i do to get the movie to paly on my notebook. It plays on the archos 404.
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